<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style>
			.box{
				width: 0;
				height: 0;
				border: 10px solid red;
				border-top: none;
				border-color: transparent transparent pink transparent;
			}
		</style>
	</head>
	<body>
		<div class="box"></div>
	</body>
</html>
